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Delete all webform results in Drupal

I have faced a problem when I have trying to delete a huge number of records (more than 10,000) that are submitted in the webform at once in Drupal 7. Every time I tried to clear data; I was redirected to a white screen and the deletion was never executed. Increasing PHP memory limit and the max_execution_time didn’t help.

In order to solve this problem, I had to directly deal with the database tables. The tables in question are: 

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